Doepfer - A-111-5 Mini Synth Voice

The LFOs can go up into the audio range, meaning they are capable of creating frequency modulations with a biting character.

The A-111-5 module is likely your last chance to experience a Dark Energy. All of the desktop instrument’s synthesis modules are included; only a MIDI-CV interface and a case need to be purchased separately if needed. In addition to functioning as a fully analog sound generator, the A-111-5 also excels as a powerful filter bank with aggressive resonance and a wide range of modulation options. The AS3394—which, in its original form as the CEM3394, was also used in the Sequential Circuits Six-Track—delivers a classic-sounding tone. Thanks to patch points, it’s possible to combine the synthesizer voice with other modular equipment.

The A-111-5 features the following components:

• Voluminous sounding VCO generating a pulse wave with variable width. Additionally, a triangle or saw-tooth waveform can be added. For tuning the oscillator, there are a three-way octave switch and a potentiometer. The knob's range can be edited via a jumper. (+/- 0.5 octaves or +/- 2.5 octaves) For playing the VCO, there is a 1v / octave connector. FM and PWM modulation paths with attenuators allow users to influence the oscillator via a LFO or the ADSR envelope.
• Low-pass filter with a strong grip. The circuit has a slope of -24 dB per octave. In addition to the obligatory frequency and resonance knobs, there is a three-way key tracking switch. – Thanks to this, the filter can be played like a sine generator while self-oscillating. Optionally, this can also be done via a second 1v / octave voltage fed to the module via a patch point. Another highlight is the wet sounding, linear Filter FM. The VCO’s triangle waveform serves as the modulation source. Exponential filter FM is possible as well. Here, a LFO or the envelope is used as the modulation source. External sound material can be fed to the filter via an audio input. – Great for processing drums!
• VCA with level potentiometer. One of the LFOs or the ADSR envelope can be used for amplitude modulation with variable strength.
• ADSR envelope with range switch. (Long, medium, short)
• Two independently usable LFOs with triangle and square waves. The frequencies are determined by potentiometers and three-stage switches. Both LFOs go far into the audio range – Great for modulating the VCO’s frequency. The results sound very harsh and energetic.